Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1987-10-20
1989-01-03
Rutledge, L. Dewayne
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148 1, C21D 100
Patent
active
047955031
ABSTRACT:
A seam welded steel pipe proofed against corrosion and prevented from oxidizing a fluid such as gasoline to be passed therethrough is produced by a process comprising forming an Ni layer by electroplating on at least one of the opposite surfaces of a steel strip, abutting the opposite edges of said steel strip in the direction of width with the Ni layer on the inside and fusing the abutted edges, subjecting the resultant steel pipe to a heat treatment in an oxidizing atmosphere thereby forming an oxide coating on the surface of the Ni layer, acid dipping the resultant steel pipe thereby removing the oxide coating from the portion of the skin of steel exposed in the neighborhood of a bead part in consequence of the fusion, and introducing a chemical Ni plating liquid through the interior of the steel pipe thereby coating the inner surface in the neighborhood of the bead part with a Ni alloy layer by chemical plating.
REFERENCES:
patent: 2490700 (1949-12-01), Nachtman
patent: 2637896 (1953-05-01), Nachtman
patent: 3202552 (1965-08-01), Thexton
Mizuhashi Toshihiko
Takahashi Teruhisa
Casella Anthony J.
Hespos Gerald E.
Rutledge L. Dewayne
Schumaker David
Usui Kokusai Sangyo Kabushiki Kaisha
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